Hoisting-drum.



Qwueutoz WW" com a M- Patented Jan.23, 1912.

UNITED STATES PA TENT oFFIon.

ALVAH D. HADSEL, OI DORRANCETON, PENNSYLVANIA, ASSIGNOR TO CABLE EXCA-VATOR COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COPARTNERSHIP.

HOISTING-DRUM.

Specification of Letters Patent.

Patented. Jan. 23. 1912.

Application filed May 2. 1910. Serial No. 558,776. Renewed July 12 1911.Serial No. 638,210.

To all whom it may concern:

Be it known that I, ALVAII D. Hansen, a citizen of the United States,residing at Dorranceton, in the county of Luzerne and State ofPennsylvania, have invented certain new and useful Improvements inHoisting-Drums. of which the following is a specificat ion.

This invention relates to hoisting machinery, and has particularreference to improvements in hoisting drums and controlling devicestherefor which possess peculiar novel features of utility and advantagehereinafter fullv described and claimed. and illustrated in theaccompanying drawing which is a side elevation, partly in section. of ahoisting drum and the parts associated therewith.

The drum 10 may be of any suitable character with respect to itssurface, but as shown is grooved for the accommodation of two hoistingor draft ropes. The drum is journalcd for rotation upon a supportingshaft 11 between a pair of driving gears 12 and 13. The gears justmentioned are adapted to be driven from a single motor, not shown, inalternation, the one gear 12 being intended to be driven at slow speedfor greater power, and the gear 13 to be driven at correspondinglyfaster speed and less power. It is well known in this art that atcertain times the maximum strength or power of the hoisting apparatus isnecessary and at other times when there is an excess of available powerit is essential that time be saved by operating the drum more rapidly.Each of said gears is adapted to be clutched to the adjacent end of thedrum. A clutch 12 is interposed between the gear 12 and the drum, and acorresponding clutch 13 between the gear 13 and the drum. These clutchesare of well known construction and operation and do not require specificdescription except to note that each clutch is adapted to be set inoperation to grip the corresponding gear to the drum by virtue of a setof toggle links pivoted to the outer face of the gear and operating upona set of bolts passing through the gear and connected to a collar on theinner; face of the gear.

At 1 5 is shown an operating lever pivoted a? a fixed oint 15 to asuitable bracket 16 o the fraliicwvork. Said lever 15 may be providedwith any suitable form of operators handlewhercby the operator of themachine will have control of both clutches. To this end a link 17 isconnected at one end of the lever and operates a pair of toggle links18. At the other end of the lever 15 is a link 19 adapted to operate apair of toggle links 20. Upon moving the lever 15 on its pivot bothpairs of toggles l8 and 20 will be operated, one pair in the directionto set .the clutch associated therewith and the other pair in adirection to release the clutch associated with them. The links 18operate a collar 21 to which the clutch toggles 22 are connected, andwhen the maid collar is moved toward the drum suflicienlly far theclutch 12 will be set. The toggle links 20 are likewise connected to acollar 23 to which the toggles 24 of clutch 13 are connected.

From the construction shown and described it will appear that theclutches may be set with very great power and in view of the fact thatthe operators of such machinery are frequently men of great strength andcomparatively little intelligence it is found necessary and advisable toprovide a means whereby it is rendered practically impossible for eitherof the clutches to be set too vigorously. whereby the machinery may besubjected to excessive and unnecessary strains. Also, it is important.that a clutch for this type of machinery shall be so designed that itwill be impossible for an overload to be placed upon the digging orconveying devices. In this connection thcrcfore it is to be noted thateach pair of toggle links operate directly from the controller lever 15and are provided with a movable abutment. The links 18 have for theirabut" ment a lever 25 pivoted at 25 to the fixed frame, the pointofconnection 18 of the adjacent toggle link being closely adjacent saidpivot 25'. The free end of the abutment lever 25 has connected to it aflexible connection 26 passing over a guide pulley 27 and to which atits other end is, connected a Weight 28 of any suitable or variableheft. Likewise the toggles 20 are provided with a movable abutment lever'29 to which is connected'the variable weight 30. Itis ap- V parenttherefore that when too much force is applied to either pair of toggles1801' 20 the abutment therefor will move outwardly away from the clutch,lifting its weight. If too much resistance should be brought to beareither upon the clutch directly or upon the load being operated upon,the movable abutment for the clutch mechanism will prevent damage to theclutch. In the first case the movable abutment would prevent theoperator from setting the clutch too tightly, and in the latter case theoverload would cause the clutch to slip. It is to be unden stood ofcourse that the weights 28 and 30 will be so timed or designed as topermit the clutches to slip in accordance with the \tlllous operationsto be performed. Again, this structure or feature of the movableabutment for the clutch will always insure prompt action of the clutchregardless of ordinary wear upon the clutch disks.

Having thus described the invention what I claim as new is 1 1. In ahoisting machine, the combination of a hoisting drum, a pair of drivinggears of different sizes associated therewith, a friction clutch betweeneach of said gears and the drum, controlling devices associated with theclutches whereby the frictional effeet of the clutches will besimultaneously controlled in opposite directions, and means whereby theforce of either clutch will be determined in accordance with the maximumload thereon.

2.. In a hoisting machine, the combination of a hoisting drum, a shaftsupporting said drum, a pair of gears mounted upon the shaft at theopposite ends of the drum, a

, clutch between each gear and the drum, collars mounted slidably uponthe shaft adjacent the respective gears, pairs of toggle links connectedto the collars, and a lever connected to said pairs of toggle links forsimultaneous operation thereof in opposite directions.

3. In a hoisting machine, the combination of a drum, a driving geartherefor, a clutch between said gear and the drum, and means foroperating said clutch, said means including a movable abutment and apair of toggle links one of which is connected to said abutment and theother of which is connected to said clutch.

4. In a hoisting machine, the combination of a. drum, a gear, a clutchbetween the gear and drum, an abutment movable automatically undervariable loads, and controlling devlces for said clutch operativebetween said movable abutment and the other features of the clutch;

In testimony whereof I at'fix my signature in presence of two witnesses.

ALVAH D. HAD SEL.

Witnesses HARRY M. KURTZ, A. L. Moons.

